1/2" x 20 unf male steel nut with non threaded lead, .755” long overall
SAE flare (45 degree/inverted/double)
Mopar/Chrysler only master cylinder brake line nut
For use with 3/16”/4.75mm OD tubing with SAE flare.
Uses 9/16” wrench.
As the name implies, this is found most often at the master cylinder but may found at ABS units and other places.